Toxicodendron diversiloba (Rhus diversiloba). POISON OAK. British Columbia to Baja California
ANACARDIACEAE (Sumac or cashew family)

Occasional
plants, spread by birds, are seen in the inner campus but they are soon removed because many residents are familiar with this easily recognized menace that is frequently encountered in the nearby state parks. The leaves are three-lobed, may resemble blackberry leaves (but there are no spines), and turn red in the fall. Not everyone is affected by touching the leaves, but the oily secretion can make a nasty, red, painful, and long-lived rash. Petting your dog after releasing it in a park is a common source of woe. Well established specimens can be found adjacent to the trails trough the Academic Preserve (The Dish area). Poison oak thrives at Jasper Ridge Biological Preserve.

Illustrations (links open new windows): leaves

Additions/Revisions:

Name derivation, genus | species Toxicoden'dron: means "poison tree" | diversely-lobed

Related material:

Botanical name index | Common name index | Family
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